iommu/amd: Use dev_data->domain in get_domain()

Using the cached value is much more efficient than calling
into the IOMMU core code.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 1 insertions, 6 deletions

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index acad37c3f0a1..155a3e6f1373 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2215,16 +2215,11 @@ static void queue_add(struct dma_ops_domain *dma_dom,
 static struct protection_domain *get_domain(struct device *dev)
 {
         struct protection_domain *domain;
-        struct iommu_domain *io_domain;
 
         if (!check_device(dev))
                 return ERR_PTR(-EINVAL);
 
-        io_domain = iommu_get_domain_for_dev(dev);
-        if (!io_domain)
-                return NULL;
-
-        domain = to_pdomain(io_domain);
+        domain = get_dev_data(dev)->domain;
         if (!dma_ops_domain(domain))
                 return ERR_PTR(-EBUSY);